Sheep shears



1,691,341 F. G. EVANS SHEEP sHEARs Nov. 13, 1928.

Filed Aug. 27, 1927 Patented Nov. 13,k 1928.

UNITED STATE PATENT "OFFICE.

Fitnnnioit :,G. Evans, er OAK PARK, ILLrNoIs, Assrenon Topenrcaeo FLEXIBLE i SHAFT: COMPANY, or CHICAGO, rumors, Ar .conroian'ron vor ILLINOIS.`

SHEEP enanas.

. `application med August 27,1927(` serrer 1ro/"215,965,

rlwhe purpose ot this invention is 'to provide a sheep shear and like tools having a iixed comb ,and reciprocatingcutter blade, ,leveractuated, inwhich the engageinentfot thefref 5 ciprocating blade bythe lei/"er'may be affected by a plurality of projections kcop-operatively situated on the lever -tor entering the recesses in the blade,land in which the registration otl the projections with `therecesses may remain 1 accurate tor avoiding lost motion or yliability to disengagement in the reciprocation for" the blade, notwithstanding slight variations du@` to expansion and contraction oit the parts by change oit temperature, or to unavoidable`inaccuracies in the original formation. The invention consists in the elements anddeatures of construction shown and described as indicated in the claims. r l

ln 'the drawingsf p v y Figure l is a .plan view of a power-driven manually directed sheep shear embodying this invention. Y

`Figure 2' is asection atthe line 2--2 on Fig ure l. l

Referring to the drawings, A is the comb and iiXed cutter of a sheep shear embodying this invention beingrigid with the body Lor casing, B, which terminates the hand-piece, C, in which is mounted plvotally at l0 the 0perating lever,'D, engaged at the rear end by l the crank wrist, ll, ot' the crank arm, 12, ot the rotating shaft, `13, journaled in the customary 40 manner in the hand-piece, C, and rotated by the usual connections, not shown, to a iexible power shaft not shown. 14 is the customary pressure pin, sometimes called a dolly pin,;

`against ,movement in fore-andaft direction through which pressure 'from the pressure spring, 20, is transmitted to the pressure forli,

F, and through saidpressure torl to the lever,` D, tor holding the reciprocating `blade pressed upon the fixed eutterblade, A, properly tor the shearing action.

5 The operating lever, D,is extendedlaterally at the 'forward `end in two divergent' pressure fingers, D1 and D?, suitably spaced apart aty their ends tor bearing on two widely-,separated teeth otthe reciprocating cuttery blade,

while the divergent ngers, f, j?, of the presfloand in thel upper tace, which, when the Figure 3 is a topp-lan view of the recipro? n sur-e i'orlrbear upontwo intermediate teeth of the,reciprocating critter 'blader y'Thefirst mentioned teeth, f1, /j`2`,h ave sii'nilar small recesses,

blade fis oi"A the customary iorinshownffa V stamping mounted or recessed the unj-V der side within the cutting margin [of the teeth-may be, as shown, an aperture opening througlji'ntothe `under side cavity `of the tooth. These'y ,recesses or aliertures are to afford means by which the operating lever, D,

by yits,,divergent-arms, D1 and D?, may engage the reciprocating cutterblade for reciprocat`` ing over vthe liXed. cutter blade,yA;y

and for such'engagement the lever isjur- 70 nished at the .extremities ot ythe arms, 'Dlaid D?, with tapered' pointed projections, d1 and cl2, adaptedtoenter the recesses, f1 and 7420, re-

spectively, and by their tapered form engage said recesses snugly so, that there shall be. no`

lostmoticn inthe reciprocating action@k y is extremely kdilliciilt quantity produc` tion oisnchparts,,on accountoi: change of di# mensions of dies, jigs, and the. hkc, due to change ottemperature, to avoid slight ,variaf 3.0' tionin such dimensions `as the distance between the recesses f1@ and f2", or `the distance between the'projections di and 2,011 [the df, vergent arms, Dl, And even if perfect accuracy and uniformity in these dimensions were obtained in the original production ot the ,parts r.nientioned, variatioinoftemperaf vture occurring yin the use of the toolfwould cause theA slight 'variations which would be suiicient to preventthe exact registration,in

'the recesses.' Y f To oi'ercome this diiieulty one ot they pron jectiens,-as .shown that on the right hand y arm, D2, oi thelever, D, is formed on a part,

X, which is carried lnovably on the lever arm, D2, having its movementlimited to the general direction ofthe rcciprocation of thereciprocating cutter by the lever, and restrained f with respect to the teeth, "."The preferred deltail construction for `thus associating said Q part, X, niovably with respect to the lever arm which carries it, is asshowIn-by pivoting the part,fX, at its rear `end to the lever arm,'D2, as seen at 30, the projection, d2, for engaging kthe recess, f2, being at the forward end of the' part, X so that by slight movement u at saidpivotal connection any inaccuracy or variation in the distance between the aper-'- tures, flo and f3, or between the ends of the `lever arms, D1 and D2, Will be accommodated,

- .ally carried projection, 720, is to properly position and hold the right' hand end of thereciprocating blade against fore-andaft displacement from` Vits proper shearing relation" toL the fixed cutter blade,

Preferably, as shovvmithe part which has the inovably earriedrprojection is not only pivoted to the lever arm, but is also housed.

in the under side of said arm, as shoWn at 40 in Figure 4, the housing being provided by a slight-marginal flange, f4, projected downward at the' end portion of thearm, D2, and

affording the area of contact of said arm for pressure on the reciprocating blade on Which said flange bears aroundthe recess, d2.

housing formed by the iian'ge, f4, With respect to the projection-carrying partl Which ithou'ses sothat the latter shall have the needed range of movement inthe direction ofthe yshearing reciprocation of the blade and no range of movement foreandaft,-as

vin the construction shoWn,-the proper action for the purpose stated Will beobtained independently of, and even Without, the' pivotal attachment ofsaid part to the lever'arm;

and I do not limit myself either to the pivotal construction or to the housing` for afford ing the desired rrange of movement and limiting the same in one direction and preventing movement' in the transverse direction.

I claim Y l. In a sheep shear and thelike in combination With a fixed comb and cutterY blade,

a co-operating reciprocating cutter blade and a lever by which the latter is reciprocated over the fixed blade, the reciprocated blade having recesses in its upper side for engagement by the actuating lever, and the lever having a plurality of projections for engaging said recesses, one of said projections be ing formed on a part carried Aby the lever and ii'iounted inovably thereon for movement With respect-,thereto at the point at Which the projection is situated, in the generaldirection of the reciproeation of the blade.

f 2. In'the construction defined in claim 1, the part having the last mentioned projection beingl pivoted to the-lever and extending 'forwardly froinits pivot, fandv having the projection at itsforivard end.

` 3. In thev construction defined in claim l, the projections being reach tapered nearly to a point, and the recesses inthe cutter blade being each diinensioned for fitting the projections at a distance back from the point of the latter substantially Without play in Itivill be `seen that by dimensioning the fore-and-'aft direction,l and vmeans for holdj ing the lever pressed onto the blade When it is actuated for reciprocating the blade.

4L. In the construction defined in claim '1,

the lever having a laterally expanded for-- 

